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The new injection uses a drug called atezolizumab, which works by blocking a protein called PD-L1. Cancer cells use this protein to hide from the immune system. Once the protein is blocked, the body's immune cells can identify and attack cancer cells

Your tongue's colour, coating and texture can reveal early signs of dehydration, vitamin deficiencies, infections and even oral cancer. Doctors explain what different tongue colours may indicate and when you should seek medical attention.